Printing device



Oct. 16, 1951 BOWERS 2,571,825

PRINTING DEVICE Filed Jan. 5, 1948 8 Sheets-Sheet l Oct. 16, 1951 BOWERS2,571,825

PRINTING DEVICE Filed Jan. 5, 1948 8 Sheets-Sheet 2 Mal/Grimmerattorney.

A. E. BOWERS PRINTING DEVICE Oct. 16, 1951 8 Sheets-Sheet 3 Filed Jan.5, 1948 W Ihwentor attorney Oct. 16, 195] ow s 2,571,825

PRINTING DEVICE v Filed Jan. 5, 1948 8 Sheets-Sheet 4 attorneg A. E.BOWERS PRINTING DEVICE Oct. 16, 1951 8 Sheets-Sheet 5 Filed Jan. 5, 1948A. E. BOWERS PRINTING DEVICE Oct. 16, 1951 8 Sheets-Sheet 6 Filed Jan.5, 1948 Gttomeg Oct. 16, 1951 E BOWERS I 2,571,825

PRINTING DEVICE Filed Jan. 5, 1948 8 Sheets-Sheet '7 i \Z M S SMala-team: ammo av "IOHM DUE M 3nventor Gttorneg A. E. BOWERS PRINTINGDEVICE Oct. 16, 1951 8 Sheets-Sheet 8 Filed Jan. 5, 1948 Patented Oct.16, 1951 UNITED STATES PATENT OFFICE PRINTING DEVICE Alton E. Bowers,Reading, Pa.

Application January 5, 1948, Serial No. 602

16 Claims. 1

This invention generally relates to the art of making photographicprints from negatives, and more particularly concerns an apparatus ordevice for simultaneously effecting a light-printed and an ink-printedmark or legend, on the opposite surfaces of the paper sheets from whichsuch photographic prints are made; and to a new method of applying suchdual markings simultaneously to said sheets.

Conventional photographic printing machines of the type utilized formaking picture prints from negatives, are usually provided with rubberor metal stamps which are operated to apply an ink-printedidentification or order number on the back of the sensitizedprint-forming paper sheet, during contact of the latter with a negative,and in conjunction with the exposure of the sensitized surface of thepaper sheet to the picture printing light. Thereafter, the print-formingsheet is developed in a chemical solution, in accordance with the usualand wellknown practice. A different identification, or order number, isapplied to the prints made up for each customer, and such numbering ofthe prints is carried out to enable proper sorting when combining thecorresponding negatives and prints in separate envelopes for delivery tothe respective customers.

It has been found in practice, that this means and method of applyingink-printed numbers to the rear surfaces of the undeveloped printformingsheets, is not very satisfactory, or practical, for various reasons.After being in use for a short time, rubber stamps provided for thispurpose, wear out, or swell up, and in doing so gradually produce a moreand more blurred, unsightly, or illegible impression. Such stamps mustconsequently be frequentl replaced, and this involves considerableexpense and loss of production time.

The substitution of metal stamps for the rubber stamps, in photographicprinting machines, substantially eliminates the indicated difficulties.However, the use of either rubber or metal stamps in photographicprinting machines, entails further detrimental results or consequences.When the sensitized surface of the paper is exposed to light and arubber or a metal stamp strikes against the,back of the paper, aphysical change takes place in the condition of the sensitized surfaceat this location. The inkprinted number will subsequently show throughthe developed print and this will noticeably affeet the appearance ofthe finished picture. Particularly so, when said number appears in anevenly shaded portion of the picture, such as in the sky of a landscapepicture.

The problems involved in overcoming these difficulties are additionallycomplicated by the device of this type at said location, and owing.

to said space limitations, the stamp devices used cannot be convenientlyinked, or adjusted, to keep the adjacent digits of the numbers in properprinting surface alignment.

One object of my invention is to provide a novel device or apparatuswhich overcomes the mentioned and other difficulties of the stampingmeans heretofore associated with photographic printing machines for thepurpose indicated.

Another object is to provide such a device in the form of a separate,small, compact, tablemodel unit, which can be readily used inconjunction with a photographic printing machine, to apply ink-printednumbers or other inkprinted matter, to the rear surfaces of theprintforming sheets, prior to the insertion of the sheets in thephotographic picture printing machine, and in such manner as toeliminate the troublesome and detrimental conditions referred to above.

A further object is to provide such a device which will effect thesimultaneous application to the print-forming sheet, of aphotographically produced or light-printed date on the front sensitizedsurface thereof, and one or more inkprinted marks or legends on the rearsurface thereof, such as an identification or order number, name,advertisement, etc.

An additional object is to provide such a device which will locate thesaid photographically and ink-printed markings on the front and rearsurfaces of the print-forming sheet, beyond the confines of the picture,i. e., in the border area surrounding the latter.

It is also an object to provide such a device which embodies certainstructural and functional features of advantage over the prior artdevices which are designed to accomplish a similar result or purpose toa limited extent.

Another object is to provide such a device which embodies various novelmechanical and electrical features and means, which are 0001)- erativelycombined and arranged in such manner that the device will effect thesimultaneous application of said markings on the front and rear surfacesof the print-forming sheet in one operation, quickly, precisely andefiiciently.

Another object is to provide such a device in which the type of theink-printing means functions to press, or hold, a certain portion of thepaper sheet in proper position to assure the application of a perfectlight-printed marking on the sensitized surface of said sheet portion.

Another unique feature of my invention resides in the provision of novelelectrical means for selectively determining the intensity of the lightto which the print-forming sheet is preliminarily exposed when thedevice photographically effects the application of a date, or othermarking, within the border area of the front sensitized surface of thesheet. This electrical means makes it possible to so relate theintensity of the light to which the print-forming sheet is preliminarilyexposed, with the intensity of the exposure light to which thesensitized sheet is subsequently subjected during the picture printingprocess, that both the light and dark contrasting effect of the picture,and the contrasting effect of the marking with respect to the pictureborder, will appear to best advantage after the sensitized sheet hasbeen developed in usual manner.

Another feature of the invention resides in the provision of a uniqueselectively operable multiple push-button switch arrangement that may beregulated, or adjusted, so that each of the in dividual push-buttonswitches determines the proper intensity of the exposure light for thevarious standard grades of print-forming sheets selected for bestresults with different photographic negatives.

Other objects of the invention include, the provision in such a printingdevice of adjustable electromagnetic actuating means for operating thestamp unit which effects an ink-printed marking on the non-sensitizedsurface of the sheet; means for selectively determining the operatingforce exerted by the electro-magnetic actuating means; an element whichis operated by the sheet and during final movement thereof to itsdetermined location, for the purpose of enabling operation of theprinting means only when the sheet is in proper printing position;light-printing means including a variable light source in conjunctionwith a plurality of selectively operable elements each arranged toadjust the light source to a different printing-light intensity and toconcurrently effect therewith either operation of the light-printingmeans, or simultaneous operation of the light-printing and ink-printingmeans; timing means for determining the exposure time of the sensitizedsurface of the sheet to the light source when effecting thelight-printed mark; locking means arranged to cooperate with each ofsaid selectively operable elements in such manner that when a respectiveelement is moved to active position it will be retained in said positionduring operation of the printing means and thereafter released forreturn movement to its inactive position; means arranged toautomatically effect return movement of said elements from their activeto their inactive positions; automatic means operative during activepositioning of one of the elements to maintain all the other elementslocked in inactive position; and an electrical switch unit whichembodies certain of said features and can be utilized in conjunctionwith a printing device as herein disclosed, or for a similar purpose inconjunction with another device.

It is also an object to simultaneously apply ink-printed andlight-printed markings to a photographic print-forming sheet or thelike, in accordance with a new method.

With these and other objects in view, which will become more apparentfrom the following detailed description of the illustrative andpractical embodiment of my device, shown in the accompanying drawings,the invention comprises the novel elements, features of construction andarrangement of parts in cooperative relationship, as more particularlydefined by the hereto appended claims.

In the drawings:

FigureI is a front perspective view of a device which embodies one formof my invention.

Fig. II is a top plan view of the device shown in Fig. I, with the upperportion of the casing thereof removed, and certain parts of the devicebroken away to more clearly disclose various structural elements andarrangements.

Fig. III is a side elevational sectional view of the device, takensubstantially as indicated by the arrows III--III on Fig. II.

Fig. III-A is an enlarged detail sectional view of certain parts shownin Fig. III.

Fig. IV is a bottom plan view of the device with the electricalconductors mainly omitted so as not to obscure certainof the structuraldetails of the device.

Fig. V is a front elevational view of the device.

Fig. VI is an enlarged, partial, elevational, sectional view, takensubstantially as indicated by the arrows VI-VI on Fig. VIII.

Fig. VII is an enlarged, partial, elevational, sectional view, takensubstantially as indicated by the arrows VIIVII on Fig. VIII.

Fig. VIII is anenlarged, fragmentary, plan view of certain details shownin Fig. II.

Fig. IX is a partial side elevational view of the device, as seen bylooking at the latter from the right in Fig. V.

Fig. X is a detail, elevational, cross-sectional view of the electricalpush-button switch device forming part of my invention, takensubstantial.- ly as indicated by the arrows X-X on Fig. IX.

Fig. XI is a fragmentary, elevational detail view of certain parts shownin Fig. X, as seen by looking in the direction of the arrow XI in thelatter.

Fig. XII is a partial plan sectional View of the said electricalpush-button switch device, taken substantially as indicated by thearrows XIIXII on Fig. IX.

Fig. XIII is a fragmentary elevational sectional view of certain partsshown in Fig. X, taken substantially as indicated by the arrowsXIII-XIII on the latter, however with one of the elements shown inanother position.

Fig. XIV is a bottom plan view of the parts shown in Fig. XIII.

Fig. XV is a partial side elevational view of certain parts shown inFig. III, and shows said parts in another position.

Figs. XVI and XVII are, respectively, front elevational and bottom planviews of the stamping or ink-printing unit embodied in my device.

Fig. XVIII is a rear view of a sensitized, photographic print-formingpaper sheet, and shows one form of ink-printed mark or legend appliedthereto, as carried out by the operation of my device.

Fig. XIX is a front view of the sensitized, printforming paper sheetshown in Fig. XVIII, and shows a photographically applied date thereon,as effected by the operation of my device, and as the date appears afterthe sensitized paper sheet has been developed, and

Fig. XX is a wiring diagram of the electrical means embodied in thedevice.

It will be helpful to an understanding of the printing device shown inthe drawings, to first briefly consider the results which can be accom-Dlished therewith, as exemplified by its use in the art of makingphotographic prints from negatives.

As previously indicated, the printing device of my invention isprimarily designed to simultaneously effect the application of printedmatter on both the front and rear surfaces of photographic sheets, suchas the various standard grades of commercially used photographicprintforming paper sheets, or the like. The printing device consequentlyperforms a dual printing operation on such sheets. That is to say,during a single operation of the printing device, it applies anink-printed marking on the non-sensitized rear surface of such aprint-forming sheet and a light-printed marking on the front sensitizedsurface of the same sheet. To my knowledge, no device has heretoforebeen provided to accomplish the said dual printing operationsimultaneously, in the manner of my printing device.

In practice, the device is utilized to perform the said dual printingoperation on a print-forming sheet, just before the latter is subjectedto the operation of a conventional type picture-printing machine. Thesheet is, therefore, first subjected to the operation of my printingdevice, then subjected to the operation of a, conventional typepicture-printing machine, and thereafter the sheet is developed in usualmanner in a chemical solution. This usual print developing procedurewill cause both the picture and the light-printed marking to appear onthe front sensitized surface of the sheet, whereas the ink-printedmatter on the rear non-sensitized surface of the sheet will not beaffected by this print developing procedure.

At the present time, six different grades of print-forming paper sheetsare ordinarily utilized in the commercial production of photographicprints from negatives. These grades are identified by the numerals 012345. The paper identified by a zero, is commonly referred to as beingthe softest, because it provides the least amount of contrast in thefinished print. The contrast provided by the other grades of papermentioned, increases substantially in the ascending order of theirnumerical identification. The grade of paper identified by a zero, isused with negatives in which the light and dark contrast is thegreatest, and the other grades cover the light and dark contrast rangeof the remaining negatives from which picture-prints are ordinarilymade. The printing device of my invention is so designed, that thelight-printed marking which is applied thereby to the sensitized surfaceof a respective or selected printforming sheet, may be made tocorrespond in contrasting effectiveness with the contrastingeffectiveness produced by a picture negative on the sensitized surfaceof said selected sheet. The manner in which my device accomplishes thisdesirable result, will become apparent as the description proceeds.

' Referring now to the drawings, Figs. XVIII and XIX illustrate,respectively, the back and 6 front appearance of a finished, ordeveloped, conventional type photographic picture-print, having appliedthereto ink-printed and light-printed markings, as effected by myprinting device in one operation.

The indicated exemplification of ink-printed matter applied by my deviceto the rear nonsensitized surface of the photographic sheet or print(Fig. XVIII) comprises, an identification or order mark, such as theletter and number shown, and the name and location of the photo-serviceconcern that made the print. These items are ink-printed by meansembodied in, and operated by, the printing device, as hereinafterexplained.

The indicated exemplification of the lightprinted marking applied by thedevice to the front sensitized surface of the photographic sheet orprint (Fig. XIX) comprises the date when the print is made, asrepresented by the month and year shown. If desired, the date may alsoinclude a number designating the respective day of the month, arrangedbetween the name of the month and the number designating the year, inusual order. These items are photographically applied, or light-printedon the front sensitized surface of the photographic sheet, ashereinafter explained.

Referring next to Fig. I, which depicts the printing device as itappears in readiness for use, the parts there visible generally comprisea lower casing member I, a cover or upper casing member 2, a coverfastening screw 3, another one of which fastening screws is located onthe opposite side of the cover (see Fig. V). Centrally located at thefront of the device is a guide arrangement for the photographicprint-forming paper sheets to be inserted into the device, whicharrangement comprises an upper paper sheet guide 4 which has securedthereto two flat spring paper depressing or tensioning fingers 4a, and alower paper sheet guide 5. A series of similar push-button switchoperating elements 6, 1, 8, 9, H), H, are alignedly mounted in an offsetportion of the casing memher I, and these elements are manually andselectively operable to start the operation of the device after thepaper sheet is in proper position. Other parts visible in Fig. Icomprise a pull-down lever l2 for changing the identification number ofthe ink-printing means, a rotatively operable knob l3 which regulatesthe pressure of the ink-printing means on the paper sheet, a red glasswindow 14 through which is visible the light from the lamp of thelight-printing means, a handle 15 for operating a toggle switch lfia(see Figs. IV, V and XX) that controls the lamp circuit of thelight-printing means, and a handle I 6 for operating a main toggleswitch lBa (see Figs. IV, V and XX) that connects the entire electricalmeans of the device with the power line.

By referring to Figs. II and III, it will become clear how themechanical and electrical parts of the device are generally located andarranged on the interior of the casing members I and 2.

At its bottom, the printing device is closed by a plate H, which issecured against integral positioning lugs of the lower casing member Iby screws l8. The interior of the casing member I has horizontallyextending therethrough a partition member or plate I9, which is made ofinsulating material, serves as a support for various parts of theprinting device, and is secured to the casing member I by screws 20.

The ink-printing means of the device is sub stantially located withinthe confines of the removable cover member 2, and generally comprises aprinting head or stamp member 2 I, which is provided with an upwardlyextending stem 22, se-

cured in a seating aperture provided therefor in the forward end ofa..stamp operating lever 23. The rear end of lever 23 is pivotallymounted between two pointed pivot screws 23a, in turn adjustably securedin a pair of lugs 212 by lock nuts 25. The lugs in which the screws 23aare mounted are integrally united with the lower casing section 5.

The printing head stem 22 is provided at its front with two flatsurfaces 26 (Fig. XVI) adapted to be engaged by the ends of two setscrews 27 which pass through the front wall section of the lever 23 andlock the printing head 2! in determined position on the latter. Theprinting head 2! comprises a specially designed type holding frame orsection 2 i a in which are mounted standard type elements 23 adapted toprovide the ink-printed legend or marking formed of letters which it isdesired to apply to the back of the photo sheeet, and an adjacentlymounted standard adjustable numbering device 29 operable by verticalreciprocation of the handle ii to effect progressive and successivechange of the number printed by number type elements 29a alignedlyarranged at the bottom of the separate number printing wheels thereof.An inking pad '36 is contactingly mounted directly beneath the typeelements 28 and 29a of the printing head 2 l, in such manner that thealigned lowermost type elements will be properly inked by the pad 39whenever the printing head 25 is in its upper or inactive position asshown in III. The inking pad 30 is mounted in a holder 35 having a :i

rearwardly extending arm 32 the free end of which is pivotly supportedby a screw 33 on a small bracket element 35 in turn rigidly secured to avertical extension 35 integrally formed with the lower casing member I.31 have their outer ends pivotly secured respectively to the outer endsof the printing head 2! by screws 38, and to the outer ends of theinking-pad holder '3 i, in such manner that when the lever 23 moves theprinting head 2i from its inactive position shown in Fig. III, to itsactive position shown in Fig. XV, the inking pad 36 will be moved fromits position of contact with the lowermost type elements 28 and 22a, tothe position shown in Fig. XV. In other words, when the printing head 2iis in its upper or inactive position, the inking pad 313 rests againstthe surface of the type elements to be printed on a photo sheet duringthe next operation of the printing head, and as the printing head 2! islowered, so as to efiect a printing operation, the

inking pad 36 is withdrawn rearwardly to its inactive position shown inFig. XV.

Extending downwardly from the lever 23, below the point where the latteris pivotly mounted, is an integral extension 39 to which is connectedone end of a helical tension spring it, the other end of which isfixedly anchored at 3! to the frame of an electrical solenoid device 2.The latter is provided with a plunger 43, the upper end of which haspivotally connected thereto a link fi l adjustably secured forlengthwise extension in a rotatively mounted member as on the lever 23.The tension spring 4t functions to urge the lever 23 to its upper orinactive position shown in Fig. III, and will normally maintain thelever 23 in said position until such time as the solenoid device 42 isoperated. The solenoid device 42 is powerful enough to overcome theaction of spring it, so that operation of the device Two separate linksJ.

42 will efiect instantaneous downward pull of the lever 23 and cause theprinting head 2i to move to its printing position shownin Fig. XV.

A rheostat [3a is mounted on the inside of the casing'member I, so as tobe operable by'the knob I3, and the said rheostat is connected incircuit with the solenoid device to control the operating force thereof,as hereinafter explained. Extending through the lever 23, and threadedlyengaged therein, is a screw it, which is adjustably locked in positionby a lock nut 41, so that the lower projecting end of the screw 46 makescontact with, and depresses an operating element 68 of a microswitch 49,when the lever 23 moves downwardly to bring the printing head 2! fromits inactive position shown in Fig. III

to its active position shown in Fig. XV. The

lower end of the screw 26 is so positioned that when the lever 23 hasbeen moved to its lowermost position, the element d8 will be depressedby the screw 46 to the extent necessary to effect closing of the microswitch 52. As hereinafter more fully explained, the micro switch 49 isarranged in circuit with a lamp 56, which forms part of the liht-printing means, so that when said switch 69 is closed, the lamp 5%will light up and effect a light-printing operation simultaneously withthe ink-printing operation. The lamp 56 is mounted in a socket 523a onthe end of a base holder SSbwhich is removably secured in the casingmember 1, as shown in Fig. V.

Directly above the lamp =59, the lower casing member l is provided witha slightly horizontally inclined flat casing extension 5! (see Fig.III), the top surface of which is arranged in a plane that passesthrough the center of the pivot point of the lever 23. The said casingextension 5| supports certain elements such as the upper paper sheetguide 4, the lower paper sheet guide 5, a transparent printing bedsection 52 formed of glass or the like, an opaque printing bed section53 of metal or the like, a flat sheet metal lever element 54 (see Fig.II), which is pivotally secured to the casing extension 5! by a screw54a. A date film or negative 55 is positioned directly against the uppersurface of the transparent and non-transparent parts 52 and 53 of theprinting bed in such manner that the light from the lamp 5% will passthrough the transparent portion '52 of the printing bed and thetransparent portion of the film to be light-printed on the sensitizedsurface of a print-forming paper sheet S placed thereagainst when thelatter is in proper printing position as illustrated in Fig. III. Therear portion of the lower paper sheet guide 5 is in the form of athree-sided frame which rests against and overlaps the front, rear andright side edge sections of the date film and holds the latter firmly inplace. The lower paper sheet guide 5 is secured against the uppersurface of casing extension Si by screws 5a, two of which also passthrough apertures in the upper paper sheet guide 4 and hold the latterfirmly in place against the lower paper sheet guide 5, however, onlyalong the right side of the latter. The forward edge 51) of thethree-sided frame forming the rear portion of paper sheet guide 5, istapered toward the date film as shown in Fig. IIIA.

It is to be noted that this arrangement of the parts just describedbrings the printing bed surface into alignment with the upper surface ofcasing extension 5 I, and therefore into said plane which passes throughthe center of the pviot point of lever 23, thereby to assure perfectprinting contact of the ink-printing type with the sheet S.

The lever element 54 is provided at its forward end with a verticallyarranged section 56 adapted to be contactingly engaged by the edge ofthe paper sheet S when inserted between the paper sheet guides 4 and 5,and thereby pushed rearwardly, so that the rear end of the element 54,which has mounted thereon an adjustable extension element 51, maycontact with a microswitch lever 58 of a microswitch 59. As hereinaftermore fully explained, the microswitch 59, when closed, closes a certainelectrical circuit arranged to establish certain contacts which must bemade before the next step in the operation of the printing device can becarried out, namely, the operation of one of the push-button switchoperating elements 6, 1, 8, 9, ID or I I. Unless the microswitch 59 hasfirst been closed, operation of a selected one of the push-button switchoperating elements will not effect operation of the printing device.However, after the microswitch 59 has been closed, then operation of aselected one of the push-button switch operating elements will result inimmediate functioning of first the ink-printing means, and then thelight-printing means while the type of the ink-printing means is stillpressing the paper sheet S against the printing bed.

The lever element 54 is arranged to be operated by the paper sheet S, inconnection with the insertion of the latter between the guides 4 and 5,and unless the sheet S is moved to its proper printing position,determined when the element 54 has reached its ultimate movementrearwardly and effected closing of the micro switch 59, the ink-printingand light-printing means will not operate when one of the push-buttonelements 6, I, 8, 9, l and H is depressed. The inclusion in the printingdevice of the paper sheet operated microswitch 59, therefore preventsthe printed matter from being improperly applied to the sheet S.

The construction of one of the push-button operated switch units isillustrated in Fig. X. Since all the other push-botton operated switchunits are substantially the same in construction, and some of the partsshown in Fig. X are common with the other similar switch units, adescription of the switch unit parts shown in Fig. X, will suffice to anunderstanding of all the other similar units.

In Fig. X, reference numerals BI, 62 and 63 designate three relativelyspaced elongated strips or plates, which are made of insulating materialand serve to similarly support and guide various parts of the individualswitch units, as shown. Certain of the parts of the switch unit shown inFig. X, are duplicated for each of the other switch units. Such partsgenerally comprise, two axially aligned metallic stems or rods 64 and64a. The upper end of the rod 54 is threaded and has threadedly engagedtherewith the push-button element 6 which is made of insulatingmaterial. The lower end of rod 64 is also threaded and is threadedlysecured in a flat-sided collar 65 which is made of insulating material.The upper end of rod 64a is likewise threaded and threadedly secured inthe lower portion of the collar 65, in spaced relation to the lower endof the rod 64. The lower end of the rod 64a has integrally formedthereon a fiat circular member or head 68. A helical compression spring61 is positioned about the rod 64a, between the lower surface of thecollar 65 and the upper surface of the insulating strip 62. Suitableapertures are provided in the guide strips 6| and 62, through which therods 64 and 64a extend, as shown, for free vertical sliding action insaid apertures. The compression spring 6'! is located between the lowersurface of the collar 65 and the insulating strip 62 and serves tonormally yieldingly maintain the rods 64 and 64a and the therewithassociated parts in their upper or inactive position. The collar 65 isprovided with a metallic fiat insert piece 69 at one side thereof. Twospring-type contact members H and 12 are vertically secured to theinsulating strip 6! in such manner that the contact point at the lowerend of the member 1| normally rests against the insulating collar 65,and the contact point at the lower end of the member 12 normally restsagainst the metallic plate 69. The members H and 12 are made ofresilient material, such as spring brass, so that when in the positionshown in Fig. X the contact points at the lower ends of thesemembers'will have good rubbing contact with the insert plate 69 as thecollar 65 moves downwardly when the push-button 6 is depressed. Themember H is provided with a terminal 13 to which a separate conductormay be connected, and the member 72 is connected to a conductor or wire14 which extends lengthwise along the plate 6! and has similarlyconnected thereto all the members of the other switch units that arelike the member 72.

The lowermost insulating plate 63 has secured to its upper surface twoflat lengthwise extending metallic conductor elements 15 and 76. Ametallic spring-type contact member 11 has one end thereof secured tothe element 15 and transversely extends over the top of the element 76so that the contact point at its free end is normally spaced from theelement 16. A piece of insulating material Tia is secured to the top ofthe contact member 77. The two conductor elements 15 and 16 extendlengthwise of the insulating plate 63 and with the similar contactmembers 1! which form part of the other switch units, combinedly make upa multiple switch arrangement for operating a solenoid device 18.

The solenoid device 18 is fixedly suspended from the insulating plate 63and is provided with a plunger 19, the outer end of which has fixedlysecured thereto an element 8|, provided with a forked free end 82, intowhich extends the downwardly bent end 83 of a lengthwise reciprocableslide or looking plate 84 that is freely reciprocable lengthwise infixed edge guides 80. The other end of the locking plate 84 has adepending section 85 to the lower extremity of which is connected atension spring 86 that is anchored at 81 to the plate 63, as moreparticularly shown in Fig. IX. As shown in Figs. XIII and XIV, thelocking plate 84 is provided with spaced apertures 88, each of whichpermits passage therethrough of one of the heads 68 of the rods 64a ofthe push-button operated switch units.

The operation of each of the individual pushbutton switch units is thesame, so that a description of the operation of the unit shown in Fig. Xwill suffice to make clear the operation of all these similar units.

When the push-button 6 is depressed, the rods 64 and 64a movedownwardly, the element 1| makes contact with the plate 69 on which theelement 12 rests, and the head 68 at the lower end of rod 84a will passthrough one of the apertures 88 of the slide plate 84, then come intocontact with the insulation piece Ila of the element l1 and push thelatter down until the con ll tact point at its free end makes contactwith the conductor l6. As hereinafter more fully explained, theconductors l and It are connected in circuit with the solenoid devicel8, so that as soon as the element ll effects an electrical current flowin the members '15 and 18, the solenoid 18 will be energized. Theplunger 19 will then be moved a short distance to the left as seen inFig. 9, and this will result in correspondingly moving the locking bar Mto the left, thereby bringing the same in contact with the respectiverod G la which has been lowered, as shown in Fig. XIII. When pressure onthe push-button 6 is released, the rods 6d and 6 2a move upwardly underthe influence of spring 6i, and the upper edge surface of the head 68will abut against the lower surface of the locking bar 84, adjacent theaperture 08 through which the rod Eda extends. The bar 80 consequentlylocks the rod 6 2a and the therewith united parts in this position whilethe solenoid device '38 is energized. While the rod 64a is in saidlocked position, the members 12 and 13 remain in contact with themetallic plate 69 causing an electrical current to flow through theseparts. form a switch that is connected in circuit with the lamp 553 andan adjustable resistance clamp 9911 which is adjustably mounted on anelongated tubular resistance member 90 of usual type having a barehelically wound resistance wire on its and 59 of the other push-buttonswitch units and the lamp 50, so that each respective push-button unit,when operated, will connect a different resistance value in circuit withthe lamp and thereby determine the glow intensity of the said lamp, ashereinafter explained. Also connected in the circuit which establishesthe glow intensity of the lamp 50, is a rheostat 9 l, which is arrangedto efiect course adjustment of said circuit when desired.

During the time that the locking bar 84 remains in its shifted positionto the left, as effected by the solenoid device 18 (see Figs. IX, XIIIand XIV), the heads 58 on the lower ends of the rods a of all thenon-operated push-button switch units are prevented from being moveddownwardly, since the said heads 68 are above the locking bar 84 out ofalignment with their respective apertures 88. Accordingly, it will beclear that the locking bar 235. not only serves to maintain the parts ofa particular push-button .switch in active position as above explained,but also prevents the other push-button switches from being operatedduring the time that the bar 84 is held in its locking position by thesolenoid device '58.

The solenoid device '48 is kept energized by electronic timing means,until the printing device has completely carried out its light-printingand ink-printing operation. After the lightprinting and ink-printingoperations have been completed, the current flow of the solenoid device18 is interrupted by the action of said electronic timing means, withthe result that the locking bar 84 will be moved to the right (Fig. IX)by the spring 85;, until it reaches its inactive position, At such timethe part 8 abuts against the end of the plate 63. The head 68 of theoperated push-button switch unit will then be released to permit returnmovement of the switch parts to inactive position, and the aper- Theparts l2, l3 and 69 tures 88 ofthe locking bar will again be broughtinto alignment with all the headsv 6% of the entire set of push-buttonswitch units, so as to permit operationof any one of them in the mannerdescribed.

The electronic timing means of the printing device comprises well-knownelectrical elements that are combined, arranged and connected inaccordance with the generally available information concerning theconstruction and operation of such timing means for various purposes. Inthe practice of providing such timing means to accomplish a certainresult, the various cooperatively connectedelectrical elements, such asthe condensers, resistances, transformers, etc., must be of the propervalue in order that the timing means will carry out its intended purposeand function in connection with the particular apparatus or device withwhich the timing means is cooperatively associated. Accordingly, theconstruction and operation of the timing means here involved, will beunderstood when the parts thereof are identified on the electricalwiring diagram of Fig. XX,and the values of these parts given, Referenceto the other drawings in which these part are shown will make clear howthese parts are mounted and arranged in the printing device. Thefunction performed-by the timing means and its-mode of operation inconjunction with the printing device will thereafter become apparentfrom a consideration of the later herein presented general descriptionof the wiring diagram and the general description of the operation ofthe-printing device.

In the electrical wiring diagram of Fig. XX, the

electrical elements which are combined and co-' operatively connected toform the said timing means, are shown within the dot-and-dash rectangleidentified b the letters TM. The refer-- ence numerals which identifythe said electrical.

elements, together with a description thereof, is presented as follows:

Ele-

mam Description 1 Two.

On the wiring diagram of Fig. XX, the previously described electricalelements which do not form part of the timing means, are identified by.

their respective reference numerals. The following additionalinformation concernin these previously described elements, is presentedfor clarification purposes:

Ele-

ment Description 25 Watt 10 ohm Variable Resistance. Toggle Switch (mainline).

Toggle Switch (for lamp 50).

volt A. O. .95 a. Int. Solenoid 15.6 ohm. Microswitch (operated by lever23).

volt 75 watt B. B. Lamp.

MicrOSWitch (operated. by paper sheet S). 110 volt A. C. 0.22 a. 110 ohmInt. Solenoid. 75 Watt 100 ohm Variable Resistance.

25 watt 100 ohm Variable Resistance.

General Description of the Wiring DiagramFig. XX

In the wiring diagram, the letters A and B identify the main line wiresof a 110 volt A. C. 69 cycle power circuit to which the printing deviceis connected for operation. The electrical connections made with thepower lines A and B and between the various electrical elements of theprinting device, are as follows:

A conductor I92 connects the line A with one terminal of the main toggleswitch Ilia, and the other terminal of the latter is connected by a wireI03 to a conductor I04, one end of which is connected to a terminal ofmicroswitch 48, the other terminal of which is connected to the filamentof lamp 59 by a wire IBM. The other end of wire I04 contacts the primarywinding of transformer 99. The other terminal of the said primarywinding of transformer 99 is connected by a conductor III! with a wire I99 which in turn is connected at I09 with a conductor IIII in connectionwith the main line B and a fixed switch element IIIOa of relay I30. Theconductor I08 is also attached to the end of the spirally wound wire ofthe variable resistance 99.

The filament of electron tube 92 has its ends connected to the secondarywinding of transformer 99 by wires I and I96.

A conductor H2 is attached to the filament of lamp 50 and to one end ofthe spirally wound wire of rheostat 9I, the regulator of which latter isconnected by a wire II3 to one terminal of the lamp toggle switch a. Theother terminal of the latter has a wire II4 attached thereto which makescontact with the conductor strip 14 from which connection is establishedto the resistance clamps 90a, 90b, 93c, 99d, 99c and 99], by conductorsnumbered, respectively, IIS, IIB, Ill, II 3. H9 and I20, whichconductors are in turn connected with the individual terminals I3 (seeFig. XI) of each of the separate push-button switch units. Thepreviously described parts of the pushbutton switch structure comprisethe elements within the dot-and-dash rectangle designated SM.

The conductor element I5 is connected by a wire I2I with a movableswitch element of the relay IIII and a conductor I22, which in turn isconnected with the conductor I94 and with a conductor I23 havingconnection with the coil of relay IOI and one terminal of electrolyticcondenser 96. The other terminal of the latter is connected with theresistor 95 by a conductor I49, to which is also connected a wire I24leading to one end of the coil of relay I9I. A wire I25 conmeets theresistor 95 with the plate element of electron tube 92. The cathode ofelectron tube 92 is connected by a wire I26 with one end of the coil ofsolenoid 42 and the other end of said coil is connected by a conductorI21 to the helical winding of the rheostat I3a. The regulator of therheostat I3a is connected by a wire I28 to a stationary switch elementIIiIa of relay II'II.

The control grid of electron tube 92 is connected by a wire I29 with oneterminal of resistor 93, and the other terminal of the latter isconnected by a Wire I36 with the two corresp0nding terminals of the twosimilar resistors 98 and The screen grid of the electron tube 92 isconnected by a conductor I32 with wire I26 and a conductor I33, theupper end of which latter contacts a terminal of resistor 94, the lowerterminal of which is connected by a wire I4I to the conductor I23. Theother end of conductor I33 is connected to one terminal of solenoid E8.The other terminal of solenoid 18 is connected by a wire I34 withstationary switch element IIIIa of relay IOI and with the wire I28. Thcooperating movable switch element of the relay IOI just referred to, isconnected by a conductor I35 with the wire I22.

Conductor element I6 is connected by a wire I36 to one terminal ofmicroswitch 59 and the other terminal of the latter is connected by awire I31 with the coil of relay I00 and with a movable element of one ofthe switch elements of the latter. A wire I33 connects the stationaryelement I09b of the switch of relay I00 just referred to, with astationary element IOIb of one of the switches of relay IIII. A wire I39connects the movable element which cooperates with the stationaryelement III9a of one of the switches of relay I90, with the conductorI26.

Operation of the printing device The printing device is connected to apower line as explained in the description of the wiring diagram of Fig.XX.

The main toggle switch Ifict and the lamp toggle switch I5a are turnedon, or closed, and the printing device will then be in readiness tocarry out its dual printing operation.

A selected photographic print-forming paper sheet S, with its sensitizedsurface turned down. is next inserted between the guides 4 and 5 so thatthe right side edge of the sheet (see Fig. VII) travels along theguiding edge provided therefor on the lower uide member 5. Movement ofthe sheet S is continued until the forward inserted edge of the sheetrides under the two paper depressing or tensiom'ng fingers 4a and abutsagainst the lever element 54 and the latter has pushed the lever 58 tothe position which effects closing of the microswitch 59. The sheet Swill then have reached the end of its movement and will be in the properposition to have ink-printed and light-printed markings or legendsapplied thereto, such as indicated in Figs. XVIII and XIX. When thesheet S is so positioned, the spring paper sheet depressin fingers 4awill maintain the portion of the sheet contacted thereby against thelower paper sheet guide 5. However, the portion of the sheet S on whichthe ink-printing and light-printing operations will be performed, willbe slightly spaced from the date film 55 as indicated in Fig. III-A.

Assuming that the selected photographic printforming paper sheet S is ofthe 0 grade type, th proper push-button to be selected and manuallydepressed for operation of the printing device, is the one havin a 0 atits top, identifled in the drawings by the reference numeral 6.

Depressing the push-button 6 to the fullest extent will effect thefollowing developments:

The head 63 at the bottom end of the rod 64a will pass through one ofthe apertures 88 in the locking bar 84, then contact th insulating piece'I'Ia on the member I! and push the latter down so that the contactpoint on its free end will contact the conductor element I6. This willcause the solenoid device 18 to become energized, thereby causingmovement of the bar 84 to its locking position so that when thepush-button 6 15 is released it will beheld in its partly loweredposition, as indicated in Fig. XIII. During downward movement of thepush-button 6, the contact members H and 12 will both be positioned onthe plate 69, and this will connect the spirally wound wire of thevariable resistance coil 99 into circuit with the lamp 5!) to theresistance clamp 90a, thereby establishing the proper glowintensity ofthe lamp 50, when the latter is illuminated. Certain of the otherelectrical circuits will also be established by this time, as will beclear by reference to the wiring diagram of Fig. XX. As a consequence,the timing means of the printing device will begin to function, thesolenoid 42 will also be energized and will pull down the printing lever23 thereby effecting an inkprinted impression on the back non-sensitizedsurface of the sheet S. During this inkprinting operation, the printingtype at the bottom of the printing head 2| will press the portion of thepaper sheet contacted therby into intimate contact with the datenegative 55. As the lever 23 moves down, it will operate microswitch 48,thereby completing the circuit which includes the lamp 59 so that thelatter Will be illuminated to the proper intensity and Will effectlight-printin of the transparent date on the date negative 55 onto thefront sensitized surface of the portion of the sheet S which is beingpressed against the date negative by the ink-printing type. It is to beparticularly noted that the type of the printing head 2| will be pressedagainst the sheet S just prior to the time that the lamp 5|! isilluminated, so that the sheet S will be firmly pressed and held by theink-printing type against the date negative 55, during thelight-printing operation, thereby to assureperfect light-printing of thedate on the sensitized surface 'of the sheet S. In other words, theink-printing type moves the portion of the sheets to which alight-printed marking is to be applied, so that the sensitized surfaceof said portion is placed exactly in the light printin plane requiredfor best light-printing results, and. the ink-printing type maintainsthe sheet portion in said plane during the lightpr-inting operation.

The timing means. of the printing device is so set that When theink-printing and light-printing operations have been simultaneouslyeffected, as indicated, the timing means will automatically operate therelay switches Hill and [BI in such manner as to open all the circuitswhich were previously established by movement of the pushbutton 6 to itslower position, as explained. This will cause the solenoid 42 to bedeenergized and immediately permit the lever 23 to be moved to itsinactive position by the spring 40. The solenoid 78 Will also becomedeenergized so that the locking bar 84 will be moved to its inactiveposition by the spring 86, and this will release the head 68 so that thepush-button 6 will be returned to its former upper, or inactiveposition, by the action of spring 61. The other elements which have beenactive, will also return to their inactive positions.

The sheet S is then withdrawn from the printing device and subjected toa picture printing operation and developed, as previously explained.After the sheet S has been withdrawn from the printing device, thelatter is in readiness to receive the next such sheet, and the operationof the device may be repeated, as explained.

If it is found that the operating force exerted by the solenoid 42 onthe lever 23 is not of the proper magnitude to effect an ink-printedimpression as desired, the operating force of the solenoid l8 may beincreased or decreased, by adjusting the rheostat 53a, one Way or theother, and this will effect an increase or decrease in the resistanceincluded in the solenoid circuit.

ihe rheostat 9i is provided to effect course adjustment of theresistance value in the circuit containing the lamp 5%. By firstproperly setting the rheostat 91, the resistance values added byrespectively, or separately, connecting the resistance clamps 901),Side, 95d, 93c and 921 in the same circuit, a Vernier-type resistanceadjustment Will be effected.

When the lamp 59 is illuminated, the operator of the printing devicewill notice this through the red glass window it, at the front end ofthe printing device, and this will indicate that the light-printingoperation is being carried out.

After the paper sheets S which belong to one order, have been operatedupon by the printing device, as described, and it is desired to changethe number to be ink-printed on the rear surfaces of the next group ofsheets S, this can be accomplished by simply pulling down the handle oflever l2 of the numbering device which forms part of the ink-printingmeans at the front end of lever 23, and then releasing the lever [2. Thelatter will then be retracted by a spring lZa, and the next consecutivenumber will then have been brought into inkprinting position by thislever action.

Of course, the printing device improvements specifically shown anddescribed, can be changed and modified in various Ways without departingfrom the invention herein disclosed, the scope of which is moreparticularly indicated by the hereto appended claims.

I claim:

1. A device for applying an ink-printed mark to the rear non-sensitizedsurface of a photographic print-forming sheet or the like and alight-printed mark to a front sensitized portion thereof, comprisingmeans provided with a transparent platen arranged to support the sheetin determined location on the transparent platen so that anon-sensitized surface section of the sheet is in overlying printingposition adjacent the printing surface of said platen for applicationvthereto of an ink-printed mark, a stamping member, means arranged toapply ink to said member, means movably mounting the stamping member foractuation into and out of printing contact with said non-sensitizedsurface section supported on and overlying said platen, selectivelyadjustable magnetic actuating means arranged to effect movement of thestamping member into printing contact with said non-sensitized surfacesection'and means for effecting light printed marking through saidtransparent platen substantially in unison with the operation of saidstamping member.

2. A device for applying an ink-printed mark to the rear non-sensitizedsurface of a photographic print-forming sheet or the like and alight-printed mark to a front sensitized portion thereof, comprisingmeans provided with a transparent platen arranged to support the sheetin determined location on the transparent platen so that anon-sensitized surface section of the sheet is inoverlying printingposition adjacent the printing surface of said platen for applicationthereto of an ink-printed mark, a stamping member, means arranged toapply ink to said member, means movably mounting the stamping member foractuation into and out of printing contact with said non-sensitizedsurface section supported on and overlying said platen, a magneticactuator arranged to effect movement of the stamping member intoprinting contact with said non-sensitized surface section, selectivelyadjustable means arranged to determine the operating force exerted bysaid magnetic actuator and means for effecting light printed markingthrough said transparent platen substantially in unison with theoperation of said stamping member.

3. A device for simultaneously applying inkprinted and light-printedmarks to the opposite surfaces of a photographic print-forming sheet orthe like, comprising means provided with a transparent platen arrangedto support the sheet in determined location on the transparent platen sothat a front sensitized surface section of the sheet is in overlyingprinting position adjacent the printing surface of said platen forapplication thereto of a light-printed marking, a stamping member, meansarranged to apply ink to said member, means movably mounting thestamping member for actuation into and out of printing contact with therear non-sensitized surface section of the sheet which is supported onsaid platen directly opposite to said sensitized surface section, asolenoid actuator for said member arranged to effect movement of thelatter into printing contact with said non-sensitized surface section,selectively adjustable means arranged to determine the operating forceexerted by said actuator and means for effecting light printed markingthrough said transparent platen substantially in unison with theoperation of said stamping member.

4. A device for simultaneously applying inkprinted and light-printedmarks to the opposite surfaces of a photographic print-forming sheet orthe like, comprising means provided with a transparent platen arrangedto support the sheet in determined location on the transparent platen sothat a marginal section of the front sensitized surface of the sheet isin overlying printing position adjacent the printing surface of saidplaten for application thereto of a light-printed mark, a stampingmember, means arranged to apply ink to said member, means movablymounting the stamping member for actuation into and out of printingcontact with the rear non-sensitized marginal section of the sheet whichis supported on said platen directly opposite to said sensitizedmarginal section, a solenoid actuator for said member arranged to effectmovement of the latter into printing contact with said non-sensitizedmarginal section, a rheostat connected in circuit with the solenoidactuator for effecting selective regulation of the operating forceexerted by the solenoid actuator and means for effecting light printedmarking through said transparent platen substantially in unison with theoperation of said stamping member.

5. A device for simultaneously applying markings to the oppositesurfaces of a photographic print-forming paper sheet or the like,comprising electrically operated light printing means, electricallyoperated ink printing means, means provided with a transparent platenarranged to support a sheet portion in determined printing location onthe device, an electrical switch for effectingelectrical connectionbetween said electrically operated light printing means and saidelectrically operated ink printing means, an element arranged to beoperated by the sheet so as to close the switch during final movement ofthe sheet portion to its printing location, and means manually operableafter said switch is closed which means is adapted to simultaneouslyeffect an ink-printed marking on the non-sensitized sheet portion and alight-printed marking on the sensitized sheet portion by said lightprinting means and said ink printing means.

6. A device for simultaneously applying markings to the oppositesurfaces of a photographic print-forming paper sheet or the like,comprising means provided with a transparent platen arranged to supporta sheet portion in determined printing location on the device, inkprinting means on one side of said platen, light printing means on theother side of said platen, and means operative to simultaneously effectan inkprinted marking on the non-sensitized surface of said sheetportion and a light-printed marking on the sensitized surface of saidsheet portion in such manner that the markings are located insuperimposed relation with respect to each other on the oppositesurfaces of said sheet portion.

7. A device for simultaneously applying markings to the oppositesurfaces of a photographic print-forming paper sheet or the like,comprising means provided with a transparent platen arranged to supporta marginal section of the sheet in determined printing location on thedevice, ink printing means on one side of said platen, light printingmeans on the other side of said platen, and means operative tosimultaneously effect an ink-printed marking on the non-sensitizedsurface of said marginal sheet section and a light-printed marking onthe sensitized surface of said marginal sheet section in such mannerthat the markings are located in superimposed relation with respect toeach other on the opposite surfaces of said marginal sheet section.

8. A device for simultaneously applying markings to the oppositesurfaces of a photographic print-forming paper sheet or the like,comprising means provided with a transparent platen arranged to supporta marginal section of the sheet in determined printing location on thedevice, ink printing means on one side of said platen, light printingmeans on the other side of said platen, and means operative tosimultaneously effect an ink-printed marking on the non-sensitizedsurface of said marginal sheet section and a light-printed marking onthe sensitized surface of said marginal sheet section in such mannerthat the markings are located in superimposed inverted relation withrespect to each other on the opposite surfaces of said marginal sheetsection.

9. A device for simultaneously applying markings to the oppositesurfaces of a photographic print-forming paper sheet or the like havinga light sensitized surface on one side and a nonsensitized surface onthe other side, comprising means arranged to support the sheet indetermined fixed location on the device, mechanical means operative toeffect an ink-printed marking on the non-sensitized surface of saidsheet, electrical means substantiall opposing said me chanical means andoperative to effect a lightprinted marking on the sensitized surface ofsaid sheet, and means effecting simultaneous operation of saidmechanical and electrical means for simultaneous marking of the opposingsensitized and non-sensitized surfaces of the sheet.

10, A device for simultaneously applying markl9 ings'to the oppositesurfaces of a photographic print-forming paper sheet or the like havinga light sensitized surface on one side and a nonsensitized surface onthe other side, comprising means arranged to support a marginal sectionof the sheet in determined printing location on the device, mechanicalmeans operative to effect an ink-printed marking on the non-sensitizedsurface of said marginal sheet section, electrical means substantiallyopposing said mechanical means and operative to effect a light-printedmarking on the sensitized surface of said marginal sheet section, andmeans arranged to effect simultaneous operation of said mechanical andsaid electrical means for imultaneous marking of the opposing sensitizedand non-sensitized surfaces of the sheet.

11. A device for simultaneously applying markings to the oppositesurfaces of a photographic print-forming paper sheet or the like,comprising means provided with. a transparent platen arranged to supporta sheet'portion'in determined printing location on the device, meansoperative to effect an ink-printed marking on the non-sensitized surfaceof the sheeti'po'rt'ion, means including a variable intensity lightsource operative to effect a light-printedma'r'king on the sensitizedsurface of the sheet portion, and means including a plurality ofselectively operable elements each arranged to adjust the light sourceto a different printing-light intensity and to concurrently efiecttherewith simultaneous operation of said ink-printing and light-printingan 12. A device for simultaneously applying markings to the oppositesurfaces of a photographic print-forming paper sheet or the like,comprising means provided with a transparent'platen arranged to supporta sheet portion in determined printing location on the device, meansoperative to effect an ink-printed marking on the nonsensitized surfaceof the sheet portion, means including a variable intensity light sourceoperative to effect a light-printed marking on the sensitized surface ofthe sheet portion, and means including at least six selectively operableelements each arranged to adjust the light source to a differentprinting-light intensity and to concurrently efiect therewithsimultaneous operation of said ink-printing and light-printing means, IV

13. A device for simultaneously applying markings to the oppositemarginal surfaces of a photographic print-forming sheet or the like,comprising means provided with a transparent platen arranged to supporta marginal section of the sheet in determined printing position on thedevice, a self-inking stamp unit operative to effect an ink-printedmarking adjacent to the edge of the non-sensitized surface of thesupported marginal sheet section, means including a variable intensitylight source operative to effect a light-printed marking adjacent to theedge of the sensitized surface of the supported marginal sheet section,and means including a plurality of selectively operable push-buttonelements each arranged to adjust the light source to a differentprinting-light intensity and to concurrently effect therewithsimultaneous operation of said ink-printing and light-printing means.

14. A device for applying a light-printed mark to a front sensitizedsurface portion of a photographic print-forming sheet or the like and anink-printed mark to a rear non-sensitized surface portion thereof,comprising means provided with a transparent platen arranged to supportthe sheet on the device so that a front sensitized surface portionthereof is in overlying printing position adjacent the printing surfaceof said platen for application thereto of alight-printed mark While anopposed rear surface portion thereof is in said overlying position forapplication thereto of an ink-printed mark, means including avariable'intensity light source operative to effect a light-printedmarking on the sensitized surface of the sheet, means for apply inganink printed mark on the opposing nonsensitized surface portion, andmeans for effecting' simultaneous operation of both of said print ingmeans.

15. A device for simultaneously applying marks ings to the opposinglight sensitized and'nonsensitized surfaces of a photographic printform: ing paper sheet or the like, comprising means provided with atransparent platen arranged to support a sheet portion in determinedprinting location on the device, ink printed marking means operativeagainst the non-sensitized surface of' the sheet portion, light printedmarking means operative against the sensitized surface of the sheetportion, means operative to simultaneously effect operation of theink-printed marking means on, the non-sensitizedsurface of the sheetportion on one side and thelightprinted marking means on the sensitizedsurface on the other side of the sheet portion, and timing means jointlyoperative with said light printing means to determine the printing timeof the light-printed marking means.

16. A device for simultaneously applying markings to the opposing lightsensitized and nonsensitized marginal surfaces of a photographicprint-forming sheet or the like, comprising means arranged to support amarginal section of thesheet in determined printing position onthe'device, a self-inking adjustable stamp unit opera-- tive to effectan ink-printed marking adjacent to the edge of the non sens'iti'zedsurface of the supported marginal'sheet section, light marking: meansincluding a variable intensity light source: operative to effect alight-printed marking adjacent'to the edge of the sensitized surface ofthe supported marginal sheet section, means including a plurality ofselectively operable push-button elements each arranged to adjust thelight source to a different printing-light intensity, each se-- lectedone of said'push button elements being adapted to eifect'simultaneousoperation of said ink-printing and light-printing means; and timingmeans arranged to determine the printing time of the light-printedmarking.

ALTON E. BOWERS.

REFERENCES orriii) The following references are of record in the file ofthis patent:

UNITED STATES PATENTS

